A set of long tube headesrs,a 4 barrel intake and a 650 carb was my best upgrade on my 84 blazer. I bet it added 50 rear wheel horse just by bolting them on.
The 350 has, over time, been the best, most versatile, small block, ever.
Aftermarket, aluminum preferred. One with massive cubes AND A WATER JACKET. They actually have a 454 SMALL BLOCK.
180 is best.
It depends on what you are going to do with them.Pulling big loads are hauling alot, the big block is nice.The small block is by far the best engine for all round use. It is cheaper to maintain too.
There are many places where one could purchase small block Chevy heads. Some of the best places to purchase small block Chevy heads at places like Amazon or Auto Zone.
4, to 6 degrees advanced, or BTDC.
Gastrol are kendell with a A/C delco filter
8 degrees
190-200 is best temp any motor well run it, best performance's and life spanned
M20 is a tricky engine to see significant changes in performance Naturally asspirated the best bang for the buck would be a performance chip from a reputable tuner Jim confronti chips as well as dinan chips are great a MAF swap will also get you some hp
The best thing to do is buy the codex
Computer re-flash $500 intercooler $800 Turbo upgrade 1200 clutch $500 intercooler pipes $300 cams $600 That will get you the best all around performance. == ==